Process for purifying polyphenylene oxides obtained by interrupt

Details Process for purifying polyphenylene oxides obtained by interrupt Process for purifying polyphenylene oxides obtained by interrupt

1984-07-18

1987-04-21

Phynes, Lucille M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Treating polymer containing material or treating a solid...

528492, 528495, 528499, 528500, C08G 6370

Patent

active

046598030

ABSTRACT:
The invention relates to a process for purifying polyphenylene oxides obtained by interruption of the copper-amine catalyzed polycondensation of di-ortho-substituted phenols, where in said process the reaction mixture is subjected to a "reaction-extraction" (i.e., an extraction which is accompanied by reaction) with water or stream, at a temperature of 60.degree. to 150.degree. C. It is particularly advantageous if the starting mixture in the inventive process comprises a solution of the polyphenylene oxide wherein the reaction has been interrupted by water and CO.sub.2, which solution is mixed into a toluene/water mixture; and further if the "reaction-extraction" is carried out in the presence of an alkanolamine and a stabilizer.

REFERENCES:
patent: 3783147 (1974-01-01), Calicchia et al.
patent: 3838102 (1974-09-01), Bennett et al.
patent: 4024107 (1977-05-01), Bennett, Jr. et al.
patent: 4097459 (1978-06-01), Bennett et al.
patent: 4263426 (1981-04-01), Cooper et al.
patent: 4460764 (1984-07-01), Reffert et al.
patent: 4463164 (1984-07-01), Dalton et al.

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